Add iswblank for libcxx.
We have similar degenerate implementations for all the other isw* functions,
so it's weird to exclude just one.
Change-Id: I659b97930e68598826c4882bb59f4146870fb6a0
diff --git a/libc/bionic/wchar.cpp b/libc/bionic/wchar.cpp
index 8d56458..8367817 100644
--- a/libc/bionic/wchar.cpp
+++ b/libc/bionic/wchar.cpp
@@ -97,6 +97,7 @@
int iswalnum(wint_t wc) { return isalnum(wc); }
int iswalpha(wint_t wc) { return isalpha(wc); }
+int iswblank(wint_t wc) { return isblank(wc); }
int iswcntrl(wint_t wc) { return iscntrl(wc); }
int iswdigit(wint_t wc) { return isdigit(wc); }
int iswgraph(wint_t wc) { return isgraph(wc); }
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index 89c6fb6..04818b9 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -70,6 +70,7 @@
extern int fwscanf(FILE *, const wchar_t *, ...);
extern int iswalnum(wint_t);
extern int iswalpha(wint_t);
+extern int iswblank(wint_t);
extern int iswcntrl(wint_t);
extern int iswdigit(wint_t);
extern int iswgraph(wint_t);